On 7 Jan, 15:19, "Janice" wrote:
I am going to make some raised beds in my garden to grow vegetables as the
present soil is heavy clay. I already had a small raised bed made from 2ft
by 6in edging slabs and the difference in yeild was startling. I imagine
lengths 8in by 2in timber would be ok so what would be the best and
prefeably cheap timber to use? And what should it be treated with?

Jan

Use CCA [Copper Chrome Arsenic] (sorry its not called that any more)
Tanalth but make sure you get the timbers the size you want either by
special request or using standard sizes for your bed
Don not cut it! do not nail it but bind it in other ways or use copper
nails on stainless strapping
Matty is not correct in that the 'A' is no longer allowed and the
heavy metal ions are chemically fixed to the hydroxyl groups and
cannot leach out - that is the idea!
That is why it is OK for kiddies playgrounds
The only removal is by fungi translocating and you are not likel to
get that in you carrots!
Chris